[yhzhang]

I need help with the question, can someone please help, I don't know where did I do it wrong. Thanks in advance.

Select True or False for each of the following statements regarding magnetism, and the earth's magnetic field "B."

1.The magnitude of earth's B is about 1E-4 Tesla.
2. B does work on a charge only when the charge has a velocity component parallel to B.
3.Like magnetic poles attract.
4.The earth's B lines are parallel to the earth's surface at all points.
5.The vector B acts only on charges at rest.
6.For a bar magnet, the B - lines exit through the N pole and return through the S pole .
7.B does work on a charge only when the charge has a velocity component perpendicular to B.

Here is my answer.
1. T
2. F
3. T
4. F
5. F
6. T
7. F